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Energies 2015, 8(7), 6350-6364; doi:10.3390/en8076350

Bio-Refining of Carbohydrate-Rich Food Waste for Biofuels

1
College of Marine and Environmental Sciences, James Cook University, Townsville 4811, Queensland, Australia
2
Comparative Genomics Centre, James Cook University, Townsville 4811, Queensland, Australia
3
Centre for Bio-discovery and Molecular Development of Therapeutics, James Cook University, Townsville 4811, Queensland, Australia
4
Centre for Sustainable Tropical Fisheries and Aquaculture, James Cook University, Townsville 4811, Queensland, Australia
*
Author to whom correspondence should be addressed.
Academic Editor: Clifford Louime
Received: 1 March 2015 / Revised: 14 May 2015 / Accepted: 9 June 2015 / Published: 25 June 2015
(This article belongs to the Special Issue Bioenergy and Biorefining)
View Full-Text   |   Download PDF [541 KB, uploaded 25 June 2015]   |  

Abstract

The global dependence on finite fossil fuel-derived energy is of serious concern given the predicted population increase. Over the past decades, bio-refining of woody biomass has received much attention, but data on food waste refining are sorely lacking, despite annual and global deposition of 1.3 billion tons in landfills. In addition to negative environmental impacts, this represents a squandering of valuable energy, water and nutrient resources. The potential of carbohydrate-rich food waste (CRFW) for biofuel (by Rhodotorulla glutinis fermentation) and biogas production (by calculating theoretical methane yield) was therefore investigated using a novel integrated bio-refinery approach. In this approach, hydrolyzed CRFW from three different conditions was used for Rhodotorulla glutinis cultivation to produce biolipids, whilst residual solids after hydrolysis were characterized for methane recovery potential via anaerobic digestion. Initially, CRFW was hydrolysed using thermal- (Th), chemical- (Ch) and Th-Ch combined hydrolysis (TCh), with the CRFW-leachate serving as a control (Pcon). Excessive foaming led to the loss of TCh cultures, while day-7 biomass yields were similar (3.4–3.6 g dry weight (DW) L−1) for the remaining treatments. Total fatty acid methyl ester (FAME) content of R. glutinis cultivated on CRFW hydrolysates were relatively low (~6.5%) but quality parameters (i.e., cetane number, density, viscosity and higher heating values) of biomass extracted biodiesel complied with ASTM standards. Despite low theoretical RS-derived methane potential, further research under optimised and scaled conditions will reveal the potential of this approach for the bio-refining of CRFW for energy recovery and value-added co-product production. View Full-Text
Keywords: anaerobic digestion; biodiesel; fatty acid methyl ester (FAME); fermentation; Rhodotorula glutinis; yeast anaerobic digestion; biodiesel; fatty acid methyl ester (FAME); fermentation; Rhodotorula glutinis; yeast
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Hao, H.-T.N.; Karthikeyan, O.P.; Heimann, K. Bio-Refining of Carbohydrate-Rich Food Waste for Biofuels. Energies 2015, 8, 6350-6364.

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